Nature of Operations Nature of Operations (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Oct. 28, 2018
Merger [Line Items]
Denbury Shares		12.4
Penn Virginia Share Price		$ 25.86
Denbury Shares, Total Approximate Issuance		0
Total Cash Payment for Penn Virginia Shares		$ 400
Shareholder Percentage		1500.00%
Merger - Termination Fee	$ 45